Flexible tubing.



A. SUNDH.

FLEXIBLE TUBING.

APPLlCATlON FILED JAN. 26. l9l8.

Patented Apr. 15,1919.

:E IS I AUGUST SUN'DH, OF HASTINGS-UPON-HUDSON, NEW YORK, ASSIGNOR TO NATIONAL CLUTCH (10., INQ, OF NEW YORK, N. Y. A CORPORATION OF NEW YORK.

FLEXIBLE TUBING.

Specification of Letters Patent.

Patented Apr. 15, 1919.

Application filed January=26, 1918. Serial No. 213,974.

To all whom it may concern:

Be it known that I, ,AUoUs'r SUNDH, a citizen of the United States, resident of Hastings-upon-Hudson, in the county of Westchester and State of New York, have reference to such tubing which is subjectedto high internal and external pressures and to rough usage, such as fluid connectors between railroad cars, etc., and it is an object of this invention to provide a flexible metallic fluid-tight tubing for these and other pu tica le.

In Prior Patents, Nos. 1,179,575 and 1,179,576, issued to me April 18, 1916, I have shown flexible metallic tubing made up of a metal strip wound spirally to form a corrugated tube, and a wire spiral, the convolutions of which are laid in the corrugations of the tube.

It is an object of the present invention to provide a structure made. up of a spirally wound corrugated strip to thecorrugations of which the convolutions of a wire spiral,-

stiif enough to control the corrugated strip, are rigidly attached. Y 4

By this construction I obtain a flexible metallic fluid-tight tubing the corrugations of which will be at all times controlled by the wire spiral; and one in which the corrugations will be always proportionately flexed when the-tubing is'bent, and-always properly spaced and maintained in their proper form.

The present construction is of high tensile strength, and the tubing as a whole is well able to withstand the-rough usage to which it is subjected without being permanently distorted, and to stand up under high internal and external pressures without dan ger of rupture or collapse.

In general the invention comprises a wirespiral, of any suitable cross section, and hereinafter referred to. as. the holder. Between the convolutions of the holder I interpose the corrugations of .a spirally wound corrugated strip. This strip is wound to form alternately inwardly and outwardly extending hope, the convolutions er the oses which will be commercially prac-' holder lying in the outwardly extending loops, and being rigidly secured thereto in any desired manner. It is to be understood of course, that it is within the scope of my invention to have the convolutions of the holder enter and be secured to the inwardly extending loops, if desired.

I have shown the adjacent edges of the spiral strip brought together and forced into a groove formed inthe convolutions of the holder, and in practice the edges of the groove in the holder'will be forced toward the edges of the strip, to make a fluid tight joint. However, it is to be understood that I am not limited to this particular type of joint, as obviously it is within the scope of my invention to make any type of joint desired. For instance the groove in the holder could be of any desired shape, or for that matter more than one groove could be formed. Also if desired the strip could be soldered or welded or rigidly secured to the holder in any other desired manner. Itis to be understood also that the cross-section of the holder need not necessarily be circular, but the holder, however, should be of sufficient strength to control the spiral strip. If desired the tubing could be thickened at the points where the greatest stress-is put upon it in operation, these thickened portions being evenly distributed throughout the tubing. I may also make the corrugated tubing of several thicknesses of metal strips, the edges of which will be secured rigidly to the convolutions of the holder. This structure would be flexible, but less liable to rupture from constant use than a tubing constructed of very thick metal, and the structure would successfully resist high external and internal pressures. As a still further variation, I may make the whole structure of a plurality ;of holders and a plurality of corrugated stripsj Such astructure would possess great 'tensile strength, and would be exceedingly useful in mines for instance where it is often necessary to suspend a long length of cable froin the overhead work, I

By having the holder attached rigidly to the corrugations of the strip, the danger of the convolutions of the holder crawling out of the corrugations of the strip. when the tubing is bent has been eliminated. It is apparent also, that the convolutions of the holder will always control the eorragations str ng e h o'or ogatio of the strip, and that therefore the latter Will always be maintained properly spaced, ndbe propo ti nat ly fiexediwhen e. ub: ing is in use. It Wil ijbG oh vious also that, I

- have provided a fluid tight flexible metallic tubing Which Will withstand the "rough usage and high pressures it is subjected to Without danger of, rupture or collapse.

In the accompanying drawings Figure l is a part sectionalel'evational view o f one fern; of lny invention Fig. 2' is a part sectional elevational View 01": a modification thereof; and

Fig; 3 is apart sectional elevational View of stillanother modification. v

Referring to 'th'e dr aWino-s in detail, and firstof all'to Fig.1 1, 1 designates 'a Wire spiral shown, for illustration only, circular in cross section, 'whi'chl shall call ,the holder. A pira y'wr uodol otr n is wo ded, a i ei s di onfi d e 'jbr ght eth ent ven irie e i and orc into a oroo'i e forrned' in the outer" surface eaeh conyolution"of"the holder 1. The strip ZWhen Wound forpisinwardly extend ns ops' nd iitwa ly xtend n p l 5, the conuoluti'dns of the holder 1 entering thelattei, oneconvol'ution to each loop. Inf other-Words, thej iiolder f l antlfthe corru a I tions of; the strip 2 are rigidly connected; to

each other Theholder 1 isr sufiiciently stiiij to' always control; corrugations of the rip. d. h o 1$r o ioo l fp'ro ido a trong; d oiii le' b'ing; fl d. ht a d. Wh 'om h orru at on w ll ways e here n hey wi alwa s e ma ntai d n; ho ri p'ropo'rl q m nd. exedfo r'o ti m,

tly throu h ut Wilt l the u ing s n so- It will be ol firious' also this'construction some :2. ub ng, well a l h od orbedififio" a gr oro o. QQ i-Y lQ i fiS IQf. the holder. this construction I have pro:

'i odl' ops T nd, "5. simila to h eper nd oiTi was rip e alls. he porp oot his oi iofi. to

t o rsioti hiii meal, re e one; ll llowfill ubi g. to bo bonfl a t 'lt iao n 'o iihioh ilvjofild no, of r s's b a esin citeme oor str lotoi' Inetal,;as" thick: as the three} strips taken toither-, h s fie bi ioi a w sea so 5 1n s th-Q over What it Would be With a solid Wall. It

is to be understood of course that three thickne ses. ofsmetalx-hare. been shown. by "W31 i llustra ion, and; that. he number, may be varied as desired.

IniFig; 3, illustrating a still further modification of my invention, I have shown two holders 1.; and 1. The adjacent, edges of a spirally ound corrugated metal strip 2" arebrought tog'ether and forced into a groove in the convolution otth e holder llfr ho adjac t edge of 'a pi ally un corrugated metal'strip 2f are brought; to; t er'fan'd or d; ntoaer qr h (a volutionj of "the other holder 1 This structure While still flexible, will be of gr'g t; tensile stren gthQand asLI, have' not efd "p viou'slj herein", will be very for use n mines, for instance, Where longj len-gtlis of and;. i owi oihi tf he orr eataoasiw i alive 8 oi d Pr PotlV paced andl' in fle i e wh nge hioh posse ses ighw 'i i z st gth fi QQQJY iQ SI la o1' o i h-r and igl f ex rnal. fifl j ntofo pr' l ifieaj ndf 1 du1i un le: h ro gh u e hi t is r. fibio fied; i oilti dae r rupture or collapseor pefmtfinent distoigtiong 109 Ido not l'i'm it myself to 'tliiefteiact iletaii ls onstructi n. herein hown; of od fi io swit i e. s n? o he l er f o ill. oo itol ho kf o finfl o ar F 'What' Iiclaiinias-n w an 5 eSi're t s nre y, ,Let' orsPa'te fi of; t e Unit d Stat i T 1. In flexible manic t pi g, w. y. t, at on of a pi al aoonol t a e, an jfr'esi iontspi allyWow? I? oiuh ohoa l. ar s i io ly oour d o, ai tain thrg uhrf 9 111g, fiuiatr p, "2;, In fl xiblemeltallio ibing ho ombinaon of pir lly oeildifio aL who, n oSilienfl ire w umlwire bi whom i tape is rigidly secured, the tilloin'g as a M: e n hcharapteria d, by the apesbein mo lexibl than, ho. wire,,' o f" h pairw se; et.

nflex ib emot l io. wh e he oomb t nil of a means; Won dT p ra11il o 9 be r id oofu odf oi he evo otions oil olo anaan? an z I g imtm ho l ati nsi 'aid'til nl oi i o notal 'io e, tion f rm m1 ape. fornia corrugated tuloe, and a ire rigidly seen djto the co portions of the tape in position to form with said wire a fluid tight structure, the periphery of the convolutions of the wire being shaped to conform to the corrugations of the tube, the wire being characterized by being less flexible than the metal tape.

5. A flexible metallic tubing comprising a spirally wound corrugated strip and a spirally wound resilient member less flexible than the strip for binding and holding together the adjacent edges of said strip, and to cause the corrugations of the strip to be distorted uniformly and proportionately when the tubing is flexed.

6. A flexible tubing, comprising a spirally wound strip having abutting edges to form a hollow member, and a holder within said member to which the strip is rigidly secured.

7. A flexible tubing, comprising a spirally wound member, having a groove in the convolutions thereof, and a corrugated strip wound about said member and having its edges secured to the groove in the first named member.

8. A flexible tubing, comprising a hollow member and a holder rigidly secured to and Within the hollow member,'the holder being of sufficient strength to control the hollow member. 7 p

9. A flexible tubing, comprising a spirally wound member having a groove in the oonvolutions thereof, and a corrugated strip wound about said member and having its adjacent edges forced into the groove in the first named member.

AUGUST SUNDH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

